Hach DR2400 - Page 302

Hardness, Total
Hardness, Total
Page 2 of 6
Hardness_MP_ULow_CPZ_Eng_2400.fm
5. Add the contents of
one Chlorophosphonazo
Solution Pillow to the
sample cell.
Note: A small amount of
solution may remain in the
pillow. This will not affect
results.
Note: One mL of
Chlorophosphonazo Solution
(Cat. No. 25895-49) may be
used instead of the solution
pillow.
6. Cap the cell and swirl
to mix. (This is the blank.)
7. Install the
multi-pathlength cell
adapter. Use the 25-mm
cell pathlength.
Note: See Section 2.6 Sample
Cell Adapters in the Instrument
Manual for adapter installation
details.
Place the blank into the
cell adapter.
8. Touch Zero.
The display will show:
0 µg/L CaCO
3
9. Remove the cell from
the instrument. Add one
drop of CDTA Reagent
for Ultra Low Range
Hardness.
Complete steps 10–11
within 1–2 minutes.
10. Cap the cell and swirl
to mix.
11. Place the cell into the
multi-pathlength cell
adapter.
Use the 25-mm cell
pathlength.
12. Touch Read.
Results will appear in
µg/L CaCO
3
.
Zero
Read